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나노 구조 물리 연구단
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Dependence of the In-Plane Thermal Conductivity of Graphene on Grain Misorientation

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Title
Dependence of the In-Plane Thermal Conductivity of Graphene on Grain Misorientation
Author(s)
Dongmok Lee; Sanghoon Lee; Byeong-Seon An; Tae-Hoon Kim; Cheol-Woong Yang; Ji Won Suk; Seunghyun Baik
Publication Date
2017-12
Journal
CHEMISTRY OF MATERIALS, v.29, no.24, pp.10409 - 10417
Publisher
AMER CHEMICAL SOC
Abstract
The thermal transport across the grain boundary (GB) is inevitably encountered for large-area polycrystalline graphene. However, the influence of GB configuration on thermal transport is not well understood. Here we investigated the effect of grain misorientation angle on the in-plane thermal conductivity (K) of suspended graphene by using the optothermal Raman technique. Graphene with well-defined grain orientation was synthesized on an electropolished, annealed, and oxygen plasma-treated single-crystalline Cu(111) substrate by low-pressure chemical vapor deposition. The k was primarily dependent on the grain size of single-, bi-, and polycrystalline graphene, consistent with the Boltzmann transport model. Surprisingly, k of bicrystalline graphene dramatically decreased with a slight misorientation (<4 degrees) between two neighboring grains. This phonon-boundary scattering was successfully simulated by the GB misorientation model. The GB length or shape also affected as a tertiary parameter. The GB misorientation angle and length, in addition to the grain size, were determining factors of K, which may be applicable for other two-dimensional materials. © 2017 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/4315
ISSN
0897-4756
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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